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//
// MoveToOuterScopeAction.cs
//
// Author:
// Simon Lindgren <simon.n.lindgren@gmail.com>
//
// Copyright (c) 2012 Simon Lindgren
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System.Collections.Generic;
using System;
using ICSharpCode.NRefactory.CSharp.Resolver;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;
using System.Threading;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Move to outer scope", Description = "Moves a declaration to the parent scope.")]
public class MoveToOuterScopeAction : ICodeActionProvider
{
#region ICodeActionProvider implementation
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
var variableDeclaration = context.GetNode<VariableDeclarationStatement>();
if (variableDeclaration == null)
yield break;
var entryNode = FindCurrentScopeEntryNode(variableDeclaration);
if (entryNode == null)
yield break;
var selectedInitializer = context.GetNode<VariableInitializer>();
if (selectedInitializer != null) {
if (HasDependency(context, entryNode, selectedInitializer)) {
yield return MoveDeclarationAction(context, entryNode, variableDeclaration, selectedInitializer);
} else {
yield return MoveInitializerAction(context, entryNode, variableDeclaration, selectedInitializer);
}
} else {
yield return new CodeAction(context.TranslateString("Move declaration to outer scope"), script => {
script.Remove(variableDeclaration);
script.InsertBefore(entryNode, variableDeclaration.Clone());
}, variableDeclaration);
}
}
static CodeAction MoveInitializerAction(RefactoringContext context, AstNode insertAnchor,
VariableDeclarationStatement declaration, VariableInitializer initializer)
{
var type = declaration.Type.Clone();
var name = initializer.Name;
return new CodeAction(context.TranslateString("Move initializer to outer scope"), script => {
if (declaration.Variables.Count != 1) {
var innerDeclaration = RemoveInitializer(declaration, initializer);
script.InsertBefore(declaration, innerDeclaration);
}
script.Remove(declaration);
var outerDeclaration = new VariableDeclarationStatement(type, name, initializer.Initializer.Clone());
script.InsertBefore(insertAnchor, outerDeclaration);
}, declaration);
}
static CodeAction MoveDeclarationAction(RefactoringContext context, AstNode insertAnchor,
VariableDeclarationStatement declarationStatement, VariableInitializer initializer)
{
var type = declarationStatement.Type.Clone();
var name = initializer.Name;
return new CodeAction(context.TranslateString("Move declaration to outer scope"), script => {
script.InsertBefore(declarationStatement, new ExpressionStatement() {
Expression = new AssignmentExpression(new IdentifierExpression(name), initializer.Initializer.Clone())
});
script.Remove(declarationStatement);
script.InsertBefore(insertAnchor, new VariableDeclarationStatement(type, name, Expression.Null));
}, declarationStatement);
}
bool HasDependency(RefactoringContext context, AstNode firstSearchNode, AstNode targetNode)
{
var referenceFinder = new FindReferences();
var identifiers = targetNode.Descendants
.Where(n => n is IdentifierExpression)
.Select<AstNode, IdentifierExpression>(node => (IdentifierExpression)node);
foreach (var identifier in identifiers) {
var resolveResult = context.Resolve(identifier);
var localResolveResult = resolveResult as LocalResolveResult;
if (localResolveResult == null)
continue;
bool referenceFound = false;
// var variable = localResolveResult.Variable;
var syntaxTree = context.RootNode as SyntaxTree;
referenceFinder.FindLocalReferences(localResolveResult.Variable, context.UnresolvedFile, syntaxTree,
context.Compilation, (node, nodeResolveResult) => {
if (node.StartLocation > firstSearchNode.StartLocation && node.EndLocation < targetNode.StartLocation)
referenceFound = true;
}, CancellationToken.None);
if (referenceFound)
return true;
}
return false;
}
static VariableDeclarationStatement RemoveInitializer(VariableDeclarationStatement variableDeclarationStatement, VariableInitializer selectedVariableInitializer)
{
var newVariableDeclarationStatement = new VariableDeclarationStatement() {
Type = variableDeclarationStatement.Type.Clone()
};
foreach (var variableInitializer in variableDeclarationStatement.Variables) {
if (variableInitializer != selectedVariableInitializer) {
newVariableDeclarationStatement.AddChild((VariableInitializer)variableInitializer.Clone(), Roles.Variable);
}
}
return newVariableDeclarationStatement;
}
AstNode FindCurrentScopeEntryNode(Statement startNode)
{
// Start one node up in the tree, otherwise we may stop at the BlockStatement
// of the current scope instead of moving up to the enclosing scope
var currentNode = startNode.Parent;
AstNode lastNode;
do {
lastNode = currentNode;
currentNode = currentNode.Parent;
if (currentNode == null)
return null;
} while (!(currentNode is BlockStatement));
return lastNode;
}
#endregion
}
}
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